Investors Borrowed $1.45 Trillion to Buy Stocks. Is the Market One Correction Away From a Margin-Call Avalanche?

Borrowed money quietly inflates stock-market returns until prices fall, and then it becomes a loaded gun. The scale of today's margin lending raises a question worth sitting with before the next downturn arrives.

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Stock-market gains can make leverage look harmless. When portfolios rise, borrowed money magnifies returns, and the debt itself can disappear into the background. That changes when prices turn lower. A margin loan does not care whether a decline is temporary or the beginning of a bear market. If account equity falls below required levels, brokers can demand more collateral or sell securities to bring the account back into compliance.

The Financial Industry Regulatory Authority’s (FINRA) latest margin data show that investors have accumulated an unusually large amount of borrowed money while stocks have also climbed sharply. That makes the next correction more important than the last one.

According to FINRA’s monthly Margin Statistics, U.S. margin debt increased by about $37 billion in August to $1.45 trillion, the second-highest reading on record behind June’s $1.50 trillion. The August balance was up $228 billion, or 19%, from the start of 2026.

The longer-term comparison is even more striking. Since the end of 2022 — and the start of the current AI-dominated era — investor borrowing has increased by $847 billion, or 140%, versus a 98% gain for the S&P 500 over the same period. That means leverage has grown faster than the market value investors have accumulated, presumably as they took on debt to buy into the AI boom.

Margin debt also has reached an unusual level relative to the economy. Research using FINRA margin data puts margin debt at roughly 4.5% of U.S. GDP, above the approximately 3.6% peak associated with 2021 and the 2.8% level around the 2000 dot-com bubble.

That doesn’t mean we could see another 2000 or 2008, but it does mean there is more leverage sitting underneath today’s stock prices.

Leverage is at an all-time high, outpacing even the Dot-Com bubble. One market slip could trigger a devastating feedback loop of forced liquidations. © 24/7 Wall St.

An investor using margin owns securities partly with borrowed money. If those securities decline, the investor’s equity shrinks. Once equity falls below the broker’s maintenance requirement, the investor may have to add cash or securities. If that doesn’t happen, the broker can sell securities — potentially without waiting for the investor’s permission. FINRA says firms can also impose higher “house” requirements.

That creates a negative feedback loop where selling puts more pressure on stocks.